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Commitments and Contingent Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract] |
Notional Amount of Outstanding Commitments | The following table identifies the notional amount of those instruments at:
| March 31, 2013 |  | December 31, 2012
| (dollars in thousands)
Financial instruments whose contract amounts represent credit risk: |  |  |
Commitments to extend credit | $ | 1,474,447 |  |  | $ | 1,506,618 |
Financial standby letters of credit | 40,829 |  |  | 47,185 |
Performance standby letters of credit | 49,249 |  |  | 69,240 |
Commercial letters of credit | 330 |  |  | 685 |

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